var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

//引入body-parser中间件模块
const bodyParser=require('body-parser');

var app = express(); 

//引入跨域管理模块
const cors = require("cors");
//配置允许跨域程序
app.use(cors({
	 origin:["http://127.0.0.1:8080","http://localhost:8080"]
}));


//使用body-parser中间件，将post请求的数据解析为对象
app.use(bodyParser.urlencoded({
  extended:false
}));

//引入session对象
var session = require("express-session");
app.use(session({
    name: 'session-id',   //给session对象指定名称
    secret: '12345-67890',  //指定字符创加密时的钥匙
    saveUninitialized: true,//初始化保存
    resave: true        //更新保存
}))



// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
